Chop the pears, stone and chop the plums, add the elderberry juice, the crumbled cinnamon sticks and the preserving sugar and let it steep for a moment. Bring everything to a boil, let it boil for 4 minutes and strain through a sieve or the brisk Lotte. Grate the chocolate and melt it in the hot jam. Bring the jam to the boil again and fill it immediately.